A federal judge on Tuesday declined to remove a gag order imposed on the president of a small ISP who wants to reveal the contents of a national security letter he received from the FBI.

The NSL demanded the president of the New York company provide the government with e-mails from a customer the government deemed a threat. An NSL, a type of self-issued subpoena fortified by the Patriot Act, allows the FBI to obtain telecommunication, financial and credit records relevant to a government investigation without a court warrant.